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lm8333 & ADP5587添加键盘背光代码
https://blog.csdn.net/yqj1123/article/details/38821087?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522164281697016780366535760%2522%252C%2522scm%2522%253A%252220140713.130102334…%2522%257D&request_id=164281697016780366535760&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2allsobaiduend~default-2-38821087.pc_search_insert_ulrmf&utm_term=lm8333&spm=1018.2226.3001.4187
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/i2c.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/input/matrix_keypad.h>
#include <linux/input/lm8333.h>
#include <linux/delay.h>
#include <linux/input.h>#define LM8333_FIFO_READ 0x20
#define LM8333_DEBOUNCE 0x22
#define LM8333_READ_INT 0xD0
#define LM8333_ACTIVE 0xE4
#define LM8333_READ_ERROR 0xF0#define LM8333_KEYPAD_IRQ (1 << 0)
#define LM8333_ERROR_IRQ (1 << 3)#define LM8333_ERROR_KEYOVR 0x04
#define LM8333_ERROR_FIFOOVR 0x40#define LM8333_FIFO_TRANSFER_SIZE 16#define LM8333_ROW_SHIFT 4
#define LM8333_NUM_ROWS 8static struct task_struct *thread = NULL;
static int key_flag = 0;
static struct delayed_work keyboard_work;
static DECLARE_WAIT_QUEUE_HEAD(waiter);static struct lm8333 *lm8333_data = NULL;struct lm8333 {struct i2c_client *client;struct input_dev *input;unsigned int keycodes[15];
};/* The accessors try twice because the first access may be needed for wakeup */int lm8333_read8(struct lm8333 *lm8333, u8 cmd)
{int repeated = 0, ret;do {ret = i2c_smbus_read_byte_data(lm8333->client, cmd);} while (ret < 0 && !repeated++);return ret;
}
EXPORT_SYMBOL_GPL(lm8333_read8);/*导出lm8333_read8（）给有GPL认证的模块使用*/int lm8333_write8(struct lm8333 *lm8333, u8 cmd, u8 val)
{int repeated = 0, ret;do {ret = i2c_smbus_write_byte_data(lm8333->client, cmd, val);} while (ret < 0 && !repeated++);return ret;
}
EXPORT_SYMBOL_GPL(lm8333_write8);int lm8333_read_block(struct lm8333 *lm8333, u8 cmd, u8 len, u8 *buf)
{int repeated = 0, ret;do {ret = i2c_smbus_read_i2c_block_data(lm8333->client, cmd, len, buf);} while (ret < 0 && !repeated++);return ret;
}
EXPORT_SYMBOL_GPL(lm8333_read_block);/*******************************************************************************
* Function : keyboard_backlight_delaywork_func
* Input : no
* Output : no
* Return : no
* Description : lm8333 backlight timeout turn off the backlight
* Author : yuqianjiang
*
*******************************************************************************/
static void keyboard_backlight_delaywork_func(struct work_struct *work)
{ keyboard_backlight_off(lm8333_data);//<span style="font-family: Arial, Helvetica, sans-serif;">KEYBOARD_BCAKLIGHT_DELAY 的延时时间到后还没有按键事件发生，执行关闭动作</span>keyboard_thread_timeout = 0; //并将键盘超时标志设置为0，接受下一次按键到来K_DBG("keyboard_backlight_delaywork_func.\n");
}/*******************************************************************************
* Function : keyboard_backlight_delaywork_init
* Input : no
* Output : no
* Return : no
* Description : lm8333 backlight delay work initialize function
* Author : yuqianjiang
*
*******************************************************************************/
static void keyboard_backlight_delaywork_init(void)\
{ INIT_DELAYED_WORK(&keyboard_backlight_work, keyboard_backlight_delaywork_func); //为键盘背光控制创建延时队列schedule_delayed_work(&keyboard_backlight_work, KEYBOARD_BCAKLIGHT_DELAY);
}/*******************************************************************************
* Function : lm8333_early_suspend
* Input : h
* Output : no
* Return : no
* Description : lm8333 resume suspend
* Author : yuqianjiang
*
*******************************************************************************/
static void lm8333_early_suspend(struct early_suspend *h)
{keyboard_backlight_off(lm8333_data);cancel_delayed_work_sync(&keyboard_backlight_work);cancel_delayed_work_sync(&keyboard_work);
}/*******************************************************************************
* Function : lm8333_late_resume
* Input : h
* Output : no
* Return : no
* Description : lm8333 resume function
* Author : yuqianjiang
*
*******************************************************************************/
static void lm8333_late_resume(struct early_suspend *h)
{ keyboard_backlight_on(lm8333_data);schedule_delayed_work(&keyboard_backlight_work, KEYBOARD_BCAKLIGHT_DELAY);schedule_delayed_work(&keyboard_work, KEYBOARD_RESET_DELAY);
}/*******************************************************************************
* Function : lm8333_keys_report
* Input : no
* Output : no
* Return : no
* Description : read lm8333 FIFO and report keys events to input system
* Author : yuqianjiang
*
*******************************************************************************/
static void lm8333_keys_report(struct lm8333 *lm8333)
{u8 keys[LM8333_FIFO_TRANSFER_SIZE];//LM8333_FIFO_TRANSFER_SIZE=16u8 code, pressed;int i, ret;ret = lm8333_read_block(lm8333, LM8333_FIFO_READ, LM8333_FIFO_TRANSFER_SIZE,keys);if (ret != LM8333_FIFO_TRANSFER_SIZE) {dev_err(&lm8333->client->dev, "Error %d while reading FIFO\n", ret);return;}for (i = 0; keys[i] && i < LM8333_FIFO_TRANSFER_SIZE ; i++) {pressed = !!(keys[i] & 0x80);code = keys[i] & 0x7f;K_DBG("success to received key[%d] : code = %d\n", i, code);//input_event(lm8333->input, EV_MSC, MSC_SCAN, code);switch(code){case 0x21:input_report_key(lm8333->input, 2, pressed);break; //1case 0x11:input_report_key(lm8333->input, 3, pressed);break; //2case 0x01:input_report_key(lm8333->input, 4, pressed);break; //3case 0x22:input_report_key(lm8333->input, 5, pressed);break; //4case 0x12:input_report_key(lm8333->input, 6, pressed);break; //5case 0x02:input_report_key(lm8333->input, 7, pressed);break; //6case 0x26:input_report_key(lm8333->input, 8, pressed);break; //7case 0x16:input_report_key(lm8333->input, 9, pressed);break; //8case 0x06:input_report_key(lm8333->input, 10, pressed);break; //9case 0x15:input_report_key(lm8333->input, 11, pressed);break; //0case 0x25:input_report_key(lm8333->input, 52, pressed);break; //.case 0x05:input_report_key(lm8333->input, 42, pressed);break; //shiftcase 0x23:input_report_key(lm8333->input, 116, pressed);break; //entercase 0x14:input_report_key(lm8333->input, 105, pressed);break; //leftcase 0x04:input_report_key(lm8333->input, 14, pressed);break; //del default: break; } }input_sync(lm8333->input);
}/*******************************************************************************
* Function : keys_event_handler
* Input : no
* Output : no
* Return : no
* Description : read keys interrupter and clear interrupter
* Judgment error events and to deal with errors
* Author : yuqianjiang
*
*******************************************************************************/
static void keys_event_handler(void)
{volatile u8 status;volatile u8 err;status = lm8333_read8(lm8333_data, LM8333_READ_INT);if (!status)return ;if (status & LM8333_ERROR_IRQ) {err = lm8333_read8(lm8333_data, LM8333_READ_ERROR);if (err & (LM8333_ERROR_KEYOVR | LM8333_ERROR_FIFOOVR)){u8 dummy[LM8333_FIFO_TRANSFER_SIZE];lm8333_read_block(lm8333_data, LM8333_FIFO_READ,LM8333_FIFO_TRANSFER_SIZE, dummy);}dev_err(&lm8333_data->client->dev, "Got error %02x\n", err);return;}if (status & LM8333_KEYPAD_IRQ){lm8333_keys_report(lm8333_data);}}/*******************************************************************************
* Function : keys_event_handler_kthread
* Input : unused
* Output : no
* Return : no
* Description : keys event handler thread main function
* Author : yuqianjiang
*
*******************************************************************************/
static int keys_event_handler_kthread(void *unused)
{struct sched_param param = { .sched_priority = 1};sched_setscheduler(current, SCHED_RR, ¶m); do{set_current_state(TASK_INTERRUPTIBLE); wait_event_interruptible(waiter, key_flag != 0); //等待按键时间key_flag = 0;set_current_state(TASK_RUNNING);if (keyboard_thread_timeout == 0) { //键盘背光是否关闭keyboard_backlight_on(lm8333_data); //键盘背光是关闭状态，则开启背光灯schedule_delayed_work(&keyboard_backlight_work, KEYBOARD_BCAKLIGHT_DELAY); //启动背光点亮延时队列keyboard_thread_timeout = 1; //同时将背光延时，开启标志设置为1}keys_event_handler();} while (!kthread_should_stop());return 0;
}/*******************************************************************************
* Function : keyboard_delay_func
* Input : work
* Output : no
* Return : no
* Description : Clear interrupt flag, prevent the FIFO overflow
* Author : yuqianjiang
*
*******************************************************************************/
static void keyboard_delay_func(struct work_struct *work)
{u8 ret;ret = lm8333_read8(lm8333_data, LM8333_READ_INT);K_DBG("keyboard_delay_func ret= %x .\n", ret);
}static irqreturn_t lm8333_irq_thread(int irq, void *data)
{key_flag = 1;schedule_delayed_work(&keyboard_work, KEYBOARD_RESET_DELAY);wake_up_interruptible(&waiter);return IRQ_HANDLED;
}/*******************************************************************************
* Function : set_key_input_bit
* Input : input
* Output : no
* Return : no
* Description : set input system keybit
* Author : yuqianjiang
*
*******************************************************************************/
static void set_key_input_bit(struct input_dev *input)
{set_bit(1, input->keybit);set_bit(2, input->keybit);set_bit(3, input->keybit);set_bit(4, input->keybit);set_bit(5, input->keybit);set_bit(6, input->keybit);set_bit(7, input->keybit);set_bit(8, input->keybit);set_bit(9, input->keybit);set_bit(10, input->keybit);set_bit(11, input->keybit);//0set_bit(14, input->keybit);set_bit(105, input->keybit);set_bit(106, input->keybit);set_bit(116, input->keybit);set_bit(56, input->keybit);set_bit(42, input->keybit);set_bit(52, input->keybit);set_bit(16, input->keybit);set_bit(17, input->keybit);set_bit(18, input->keybit);set_bit(19, input->keybit);set_bit(20, input->keybit);set_bit(21, input->keybit);set_bit(22, input->keybit);set_bit(23, input->keybit);set_bit(24, input->keybit);set_bit(25, input->keybit);set_bit(26, input->keybit);set_bit(27, input->keybit);set_bit(30, input->keybit);set_bit(31, input->keybit);set_bit(32, input->keybit);set_bit(33, input->keybit);set_bit(36, input->keybit);set_bit(35, input->keybit);set_bit(37, input->keybit);set_bit(38, input->keybit);set_bit(44, input->keybit);set_bit(45, input->keybit);set_bit(46, input->keybit);set_bit(47, input->keybit);set_bit(48, input->keybit);set_bit(28, input->keybit);input->evbit[0] = BIT_MASK(EV_KEY);
}static int __devinit lm8333_probe(struct i2c_client *client,const struct i2c_device_id *id){struct lm8333_platform_data *pdata = client->dev.platform_data; struct lm8333 *lm8333;struct input_dev *input;int err, active_time;K_DBG("debounce_time: %d\n\n",pdata->debounce_time);if (!pdata){return -EINVAL;}active_time = pdata->active_time ?: 500;if (active_time / 3 <= pdata->debounce_time / 3) {dev_err(&client->dev, "Active time not big enough!\n");return -EINVAL;}lm8333 = devm_kzalloc(&client->dev, sizeof(*lm8333), GFP_KERNEL);input = input_allocate_device();if (!lm8333 || !input){err = -ENOMEM;goto devm_kfree;}input->name = client->name;input->dev.parent = &client->dev;input->id.bustype = BUS_I2C;lm8333->client = client;lm8333->input = input;lm8333_data = lm8333;K_DBG("keyboard_backlight_hrtimer_func %p\n", lm8333_data);i2c_set_clientdata(client, lm8333);set_key_input_bit(input);//input_set_capability(input, EV_MSC, MSC_SCAN);if (pdata->debounce_time){err = 0;err = lm8333_write8(lm8333, LM8333_DEBOUNCE, pdata->debounce_time / 3); if (err){dev_warn(&client->dev, "Unable to set debounce time\n");}}if (pdata->active_time) {err = lm8333_write8(lm8333, LM8333_ACTIVE, pdata->active_time / 3); if (err){dev_warn(&client->dev, "Unable to set active time\n");} }err = devm_request_threaded_irq(&client->dev, 101, NULL,lm8333_irq_thread,IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm8333", lm8333);if (err){goto free_input;}K_DBG("require IRQ successful \n\n");INIT_DELAYED_WORK(&keyboard_work, keyboard_delay_func);schedule_delayed_work(&keyboard_work, 100);//configure GEN_IO_1 to outputkeyboard_backlight_init(lm8333); //初始化键盘芯片IOkeyboard_backlight_delaywork_init(); //初始化键盘背光延时队列thread = kthread_run(keys_event_handler_kthread, 0, "lm8333"); //创建线程来轮询按键情况，根据不通情况去执行开关键盘背光if (IS_ERR(thread)){err = PTR_ERR(thread);K_DBG("lm8333 failed to create kernel thread: %d\n", err);goto free_irq;}err = input_register_device(input);if (err){goto free_irq;}lm8333_early.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;lm8333_early.suspend = lm8333_early_suspend;lm8333_early.resume = lm8333_late_resume;register_early_suspend(&lm8333_early);K_DBG("\n\nregister lm8333 successful \n\n");return 0;devm_kfree:devm_kfree(&client->dev, lm8333);free_input:input_free_device(input);printk("\n\nregister lm8333 failed !\n\n");
free_irq:devm_free_irq(&client->dev, 101, lm8333);return err;
}static int __devexit lm8333_remove(struct i2c_client *client)
{struct lm8333 *lm8333 = i2c_get_clientdata(client);devm_free_irq(&client->dev, 101, lm8333);input_unregister_device(lm8333->input);input_free_device(lm8333->input);devm_kfree(&client->dev, lm8333);return 0;
}static const struct i2c_device_id lm8333_id[] = {{ "lm8333", 0 },{ }
};
MODULE_DEVICE_TABLE(i2c, lm8333_id);static struct i2c_driver lm8333_driver = {.driver = {.name = "lm8333",.owner = THIS_MODULE,},.probe = lm8333_probe,.remove = __devexit_p(lm8333_remove),.id_table = lm8333_id,
};static int __init lm8333_init(void)
{printk("\ninit lm8333\n\n");return i2c_add_driver(&lm8333_driver);
}module_init(lm8333_init);static void __exit lm8333_exit(void)
{i2c_del_driver(&lm8333_driver);
}
module_exit(lm8333_exit);MODULE_AUTHOR("Wolfram Sang <w.s...@pengutronix.de>");
MODULE_DESCRIPTION("LM8333 keyboard driver");
MODULE_LICENSE("GPL v2");
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